Movement in Organisms

Q.

What is reflex arc ?

Q. Growth of pollen tube towards ovule is an example of

1. Thigmotropism
2. Geotropism
3. Hydrotropism
4. Chemotropism

Q.

How is the movement in plants different from that of animals ?

Q. Blinking of eyes is which type of action and why?

Q.

A reflex action in the body is controlled by CNS.

1. ANS

2. CNS

Q. trace the events occurring in a reflex action such as sneezing .

Q. Which one of the following is not an endocrine gland?
(a) Thyroid
(b) Liver
(c) Pancreas
(d) Thymus

Q.

Pons connects

1. Brain with spinal cord

2. Cerebrum with cerebellum

3. Two-lobes of cerebellum

4. Two cerebral hemispheres

Q. Difference between Reflex action and Involuntary action

Q.

Plant hormones show various actions and visible effects on plants. They also help in the conduction of vital activities of plant-like phototropism, negative geotropism, growth, ripening of fruits etc. Each hormone shows particular action and visible effect on plants. Consider the given action and visible effects of hormones on plants and select the specific hormone responsible for these activities.

Hormones	Action	Visible effect
A	Cell elongated under turgor pressure	Tips bends towards light.
B	Growth of cells	Growth of plants, germination of seeds, flowering, and fruits enlargements.
C	Antagonizes auxins on leaf buds promotes cell division and differentiation	Growth of lateral branches
D	Growth inhibition	Seed dormancy and vernalization and drought tolerance
E	Fruits ripening and leaf drop	Increased sugar in fruit, leaf, and fruit drop.

Q. Which of the following is a characteristic of the reflex action?

1. It happens differently each time.
2. It has to be learnt.
3. It need not be learnt.
4. It can be easily copied.

Q. (a) Define reflex action. State its significance.

(b) How do plants respond to external stimuli ?

Q.

What is the significance of reflex action.

Q.

Blinking of eyes is an

1. Involuntary reflex action

2. Involuntary action

3. Reflex action

4. Voluntary action

Q.

What is difference between a reflex action and walking

Q. Explain reflex arc and reflex action briefly.

Q. What are the types of reflexes?is cerebral reflex a type of reflex?what is cerebral reflex?give an example

Q. Fill in the Blanks

A phytohormone not associated with plant growth is

Q.

Define reflex action. Give one example. Show with the help of a flaw diagram the path of reflex action.

Q. Define reflex action with a suitable example.
Also, explain the components of reflex arc with a well labelled diagram.
[5 Marks]

Q. Mention the function of the following plant hormones.​
(i) Auxin​
(ii) Cytokinin [2 Marks]

Q.

What happens in reflex action?

Q.

what is the function of receptors in human body? what are the types of receptors found in humans? what problems are likely to occur if receptors do not work properly?

Q. Which of the following is not associated with growth of plant?

1. Auxin
2. Gibberelllins
3. Cytokinins
4. Abscisic acid

Q.

Briefly explain the following term.

Reflex action

Q. Differentiate between involuntary action and reflex action

Q.

Name the plant and animal hormone on the basis of function given below:

• The hormone that stimulates the thyroid gland to secrete thyroid hormones…………
  

Q.

An automatic response that does not involve the control of brain is called ____________ action.

1. reflex

2. sensitivity

3. voluntary

4. systemic

Q.

An automatic response that does not involve the control of brain is called ____________ action.

1. reflex

2. sensitivity

3. voluntary

4. systemic

Q.

A stimulus is ________ .

1. a plant hormone

2. an enzymatic reaction

3. a deadly infection

4. an external impulse